AcWing 793. 高精度乘法
原题链接
简单
作者:
跟着灿哥学切菜
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2021-01-12 16:04:39
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所有人可见
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阅读 300
#include <iostream>
#include <vector>
using namespace std;
vector<int> mul(vector<int> &A, int b) {
vector<int> c;
int t = 0;
for (int i = 0; i < A.size() || t; i ++) {
if (i < A.size()) t += A[i] * b;
c.push_back(t % 10);
t /= 10;
}
//此时还是将后面的0去掉
while (c.size() > 1 && c.back() == 0) c.pop_back();
return c;
}
int main() {
string a;
int b;
cin >> a >> b;
vector<int> A;
for (int i = a.size() - 1; i >= 0; i --) A.push_back(a[i] - '0');
auto c = mul(A, b);
for (int i = c.size() - 1; i >= 0; i --) cout << c[i];
return 0;
}